Abstract

PEREZ-RENDON, B; GARCIA-SEGURA, G  and  LANGER, N. Evolutionary effects of rotation in massive stars and their circumstellar medium. Rev. mex. fis. [online]. 2008, vol.54, suppl.2, pp.95-100. ISSN 0035-001X.

Massive main sequence stars are fast rotators [1] but most of up to date evolutionary stellar models do not take account this important physical process. Stellar rotation affects the massive stellar evolution due to the rotationally induced mixing processes, the increase of mass loss rates, etc. [2] and stellar rotation also affects the circumstellar medium due to stellar wind interaction. The parameters of stellar wind depend on stellar luminosity, mass, radius and metallicity so the wind parameters change as the star evolves coupling the evolution of circumstellar medium to the star itself. In this work we used the stellar code STERN to investigate the evolution of a 29 M massive star with solar composition including rotation and no-rotation with the same input physics, in order to study the effect of rotation in stellar evolution and their circumstellar medium. We observe that rotating star develops a Wolf-Rayet phase whereas the non-rotating star does not. We use the output of stellar code as inner boundary conditions in the hydrodynamical code ZEUS-3D to simulate the dynamical behavior of circumstellar medium around each star. As consequence of evolutionary changes induced by rotation the pre-supernova circumstellar medium is quite different for the same progenitor mass.

Keywords : Stellar rotation; stellar evolution; circumstellar medium.

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